Hiya
My RSVP wording was as follows:
Thank youf or your kind invitation.
I/ We are able/ unable to attend on 23rd April, 2005
from .................................................. .....
Vegetarian Menu Required? Yes/ No
Further comments/ Dietary information
.................................................. ............
.................................................. ............
RSVP Address details
RSVP by 12th March
Hope this helps.
xx